At first the gameplay was kinda linear, it didn't catch my interest until i got into some castles, thats when the gameplay picked up, with a nicely animated background and character sprites the only thing missing was some retro sounding music.
it's good that you add in some new obstacles and enemies as the game progresses to stop the game from getting stale.
Last level was pretty anti-climactic since i was hoping for a platforming boss battle of some sort but it was just more platforming, not even that hard either.

Overall okay game but music could really help set the mood and if you still can i would suggest adding some.